The mass of any given substance contained in unit volume.

plural of specific density

(taxonomy) A specimen whose characteristics are used to describe and name a species

(ornithology) A species utilised by a brood parasite to raise young.

plural of species-monger

(derogatory) A biologist who is overly concerned with narrow classification, indifferent to wider relationships.

simple past tense and past participle of special case

plural of special case

Third-person singular simple present indicative form of special case

present participle of special case